Dangerous Hurricane Willa probed By NASA and Japan's GPM satellite

October 22, 2018, NASA's Goddard Space Flight Center
GPM passed above Willa on October 21, 2018 at 3:51 p.m. EDT (1951 UTC). The location of precipitation in Willa's well defined eye wall was made evident by GPM's radar (DPR Ku Band). DPR indicated that a few powerful convective storms within Willa were dropping rain at a rate of over 6.3 inches (160 mm) per hour. Credit: NASA/JAXA, Hal Pierce

Hurricane Willa is a major hurricane threatening western Mexico. Forecasters were able to see the rate of rainfall occurring within the powerful storm when the Global Precipitation Measurement mission or GPM's core satellite passed overhead and provided that data.

On Oct. 22, the National Hurricane Center or NHC noted that "Will became a potentially catastrophic category 5 on the Saffir-Simpson and is expected to produce life-threatening storm surge, wind, and rainfall over portions of west-central and southwestern Mexico."

Willa's Rapid History

Willa formed on Saturday, Oct. 20 and quickly became a tropical storm. By 5 p.m. EDT, Willa strengthened into a and continued to strengthen.Hurricane Willa was a Category 4 hurricane and moving northward toward the western coast of Mexico when the GPM core observatory passed above on October 21, 2018 at 3:51 p.m. EDT (1951 UTC). At that time, the hurricane had maximum sustained winds of about 95 mph (109 knots).

GPM Satellite Provides Rainfall Rates

GPM's Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) instruments collected data showing that hurricane Willa and feeder bands were producing heavy rainfall over a large area. The location of precipitation in Willa's well defined eye wall was made evident by GPM's radar (DPR Ku Band). DPR indicated that a few powerful convective storms within Willa were dropping rain at a rate of over 6.3 inches (160 mm) per hour.

GPM passed above Willa on October 21, 2018 at 3:51 p.m. EDT (1951 UTC). The location of precipitation in Willa's well defined eye wall was made evident by GPM's radar (DPR Ku Band). DPR indicated that a few powerful convective storms within Willa were dropping rain at a rate of over 6.3 inches (160 mm) per hour. GPM's radar shows that a few powerful storms in the eye of the hurricane were reaching heights above 8.7 miles (14.0 km). Click to see 3-D flyby animation. Credit: NASA/JAXA, Hal Pierce

At NASA's Goddard Space Flight Center in Greenbelt, Md. a simulated 3-D view was created of the storm looking from the south-southeast reveals hurricane Willa's rainfall structure. It was developed using GPM's radar data (DPR Ku Band). That DPR data enabled a cross-section view that shows the anatomy of precipitation around hurricane Willa's eye. Intense radar echoes of up to 57dBZ are shown (dark red) in this slice through the center of the intensifying hurricane. GPM's radar shows that a few powerful storms in the eye of the hurricane were reaching heights above 8.7 miles (14.0 km). These tall storms referred to as "hot towers" are often an indication of hurricane intensification. These powerful convective storms near the center of the hurricane were releasing energy in the form of latent heat of condensation that powers the hurricane.

GPM is a joint mission between NASA and JAXA, the Japan Aerospace Exploration Agency.

Willa's Expected Rainfall

The National Hurricane Center said "Willa is expected to produce storm total rainfall accumulations of 6 to 12 inches, with local amounts to 18 inches, across portions of western Jalisco, western Nayarit, and southern Sinaloa in Mexico. This rainfall will cause life-threatening flash flooding and landslides. Farther inland, Willa is expected to produce rainfall amount of 2 to 4 inches across portions of Zacateca, Durango, southeast Chihuahua, and Coahuila in Mexico, with local amounts to 6 inches possible. This could cause life-threatening flash flooding."

GPM passed above Willa on October 21, 2018 at 3:51 p.m. EDT (1951 UTC). The location of precipitation in Willa's well defined eye wall was made evident by GPM's radar (DPR Ku Band). DPR indicated that a few powerful convective storms within Willa were dropping rain at a rate of over 6.3 inches (160 mm) per hour. GPM's radar shows that a few powerful storms in the eye of the hurricane were reaching heights above 8.7 miles (14.0 km). Credit: NASA/JAXA, Hal Pierce
Warnings and Watches in Effect on Oct. 22

A Hurricane Warning is in effect for San Blas to Mazatlan, including Las Islas Marias. A Tropical Storm Warning is in effect for Playa Perula to San Blas and north of Mazatlan to Bahia Tempehuaya.

Status of Willa on Oct. 22

At 11 a.m. (1500 UTC) on Oct. 22 the center of Hurricane Willa was located near latitude 19.1 degrees north, longitude 107.2 degrees west. About 175 miles (280 km) south-southwest of Las Islas Marias Mexico. Willa is moving toward the north near 7 mph (11 kph), and this general motion is expected to continue today.

Satellite data indicate that the have increased to near 160 mph (260 kph) with higher gusts. Willa is a category 5 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some strengthening is still possible today. Slight weakening is forecast to begin on Tuesday, but Willa is expected to be an extremely dangerous major hurricane when it reaches the coast of Mexico. Hurricane-force winds extend outward up to 30 miles (45 km) from the center and tropical--force winds extend outward up to 105 miles (165 km).

The National Hurricane Center (NHC) predicts Willa to accelerate toward the north-northeast and move over or very near the Islas Marias early Tuesday and make landfall along the southwestern coast of mainland Mexico in the hurricane warning area Tuesday afternoon or evening.

Explore further: Dangerous Hurricane Willa closes in on Mexico

Related Stories

Dangerous Hurricane Willa closes in on Mexico

October 22, 2018

Hurricane Willa surged to a dangerous Category Four storm off Mexico's Pacific coast, US forecasters said Sunday, warning of a life-threatening storm surge and heavy winds and rainfall.

NASA sees Walaka becoming a powerful Hurricane

October 2, 2018

The Global Precipitation Measurement mission or GPM core satellite passed over the Central Pacific Hurricane Center and analyzed Walaka's rainfall and cloud structure as it was strengthening into a hurricane.

GPM satellite sees Fabio strengthening into a hurricane

July 2, 2018

NASA's Global Precipitation Measurement mission or GPM core observatory satellite flew above Tropical Storm Fabio in the eastern Pacific Ocean as the storm was quickly strengthening into a hurricane. GPM provided a look at ...

NASA's GPM peers under the clouds of Hurricane Florence

September 6, 2018

Hurricane Florence became more powerful over the past few days while moving through the central Atlantic Ocean and wind speeds increased from tropical storm force to a Category 3 hurricane. The GPM core satellite provided ...

Intensifying Hurricane Lane examined by GPM satellite

August 18, 2018

Heavy rainfall and towering cloud heights were the findings when Hurricane Lane was scanned by the Global Precipitation Measurement mission or GPM core observatory satellite on Aug. 17. Lane strengthened to a Category 2 hurricane ...

Recommended for you

Greenhouse gasses triggering more changes than we can handle

November 19, 2018

A new study published in Nature Climate Change provides one of the most comprehensive assessments yet of how humanity is being impacted by the simultaneous occurrence of multiple climate hazards strengthened by increasing ...

Local drivers of amplified Arctic warming

November 19, 2018

Long-term observations of surface temperatures show an intensified surface warming in Canada, Siberia, Alaska and in the Arctic Ocean relative to global mean temperature rise. This warming pattern, commonly referred to as ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.